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Old 06-14-2013, 12:51 PM   #1
afbd5
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Default Need someone to call about 4EAT

I am stationed in Japan and am having a bunch of intermittent issues with a 2001 legacy B4 w/ tiptronic 4eat trans. I want to call somebody in the states to discuss the issues and maybe figure out a diagnostic starting point. I have previously tried Import Performance Transmissions, but he wouldn't offer an opinion or even hint at a starting point. Just post or pm me a number and a good time (including time zone) to get ahold of you. Any kind of response is greatly appreciated, so thank you for any and all that answer this call for help.
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Old 06-14-2013, 02:17 PM   #2
gggplaya
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Why not just post your symptoms on here.
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Old 06-14-2013, 11:27 PM   #3
afbd5
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Tried that before. Couldn't get much info. I figure it would be easier if I could talk it through with someone.
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Old 06-18-2013, 12:37 PM   #4
CNY_Dave
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Is that trans anything like the US spec 4EAT?
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Old 06-21-2013, 02:27 AM   #5
afbd5
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I would have to think so. Main difference is most likely the TCU programing.
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Old 06-24-2013, 06:47 PM   #6
CNY_Dave
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I'm not that well-versed on transmissions, but on usmb there are some pros.
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Old 06-27-2013, 06:57 AM   #7
afbd5
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usmb???
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Old 07-02-2013, 06:57 PM   #8
CNY_Dave
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Old 07-02-2013, 07:20 PM   #9
Blktrax
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I read your other thread, what trans fluid did you have the trans flushed with?

US market 4eat after 2004 required Subaru HP , fluid that is synthetic.

Subaru fluid has special modifiers like LSD oil to keep the Center Diff happy and from chattering while turning.

When flushing, or changing fluid the trans has to be put into and AIR BLEED mode for the shift solenoids. Usually it works out over time if not but can cause shift quality issues.

What you described in your other thread is very common with wrong fluid used; Or Mismatched tire/tread depth of more than 1/4" circumference difference.


Other possibilities are the front seal to the diff is leaking causing ATF or get into the Diff and Diff oil into the ATF.... Or the radiator trans cooler is leaking in to the ATF. Both rare issues, but have occurred.
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Old 07-03-2013, 04:32 PM   #10
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Blktrax, what you mention about the LSD oil in the ATF and the air-bleed mode, that's for the all-electronic 4EAT starting 2005?

I have heard of adding LSD goop to older 4EATs to help smooth the MPT engagement.
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Old 07-03-2013, 07:56 PM   #11
Blktrax
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The friction modifiers that are made into the SUBARU HP ATF, act LIKE an LSD oil for the 4EAT center diff.

I've never heard of anyone adding LSD additive to ATF, I would imagine it would effect shift quality negatively.

Yes the HP fluid was designed for 2005 and later 4EAT and 5EAT, but Subaru recommends it for all ATF use in Subaru vehicles.
Air bleed is only available on EAT models, the older 4AT do not, has to be done through the TCM on the Subaru Diagnostic Laptop.

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Old 07-04-2013, 04:09 AM   #12
afbd5
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I actually replaced the old trans from the previous thread. It has been filled with oem subaru Type HP fluid. The original symptoms had started to return which prompted this thread. At low throttle input it will shift back and forth from 3rd to 2nd if rpm drops below 1500. Once up to speed (above 50kph) it will eventually shift into 4th, but drop back out a few seconds later and proceed to shift back and fourth between the gears. It will only hold 4th gear above 75kph and even then it is quick to downshift if more throttle is induced. It will shift just fine through all gears when placed into tiptronic mode. Occasionally, if more than 60-75% throttle is given the car will abruptly/violently short shift and hold the gear that it just went into. The only way to "clear it out" is to come to a complete stop, place it in park, then back into drive. I did some digging and found out that sometimes there are TPS issues with these cars. my test results are as follows: All testing done with key on engine off at the sensor. .65v at idle position and 4.05V at WOT with 5v input voltage. I don't know what the reading is supposed to be at those throttle positions. Anybody have anything?
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Old 07-04-2013, 07:20 AM   #13
Blktrax
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Well if its a EJ2.5 non turbo or EZ30 6 the specs should be the same as a US car. If its that Twin Turbo its nothing like the 04-06 Legacy/Baja Turbo here, but the trans might be similar with SPORT Shift.


TPS Spec
0.2 - 1.0V Idle
4.2 - 4.7v WOT

However if there is a known issue, if there's a dead spot or spike, that would cause issues, I'd just replace it.

Whats strange is you said the issues are beginning to return, was the torque converter replaces as well?

If not I'd suspect low line pressure and its burning up the clutches.

Also Subaru TCM's have 2 clear modes.

Clear Memory 1 - does the same thing as disconnecting the battery

Clear Memory 2 - Has to be done with a Subaru Scan tool, its hard learned default values for the valve body in the trans. After performing this clear mode a drive cycle has to be done to relearn operation to compensate for parts replacement and wear.


Last edited by Blktrax; 07-04-2013 at 07:37 AM.
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Old 07-05-2013, 10:05 PM   #14
afbd5
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It is a 2002 JDM twin turbo model. I am going to replace TPS sensor and see about getting the TCM reset. Keepin my fingers crossed cause I need this car sellable as I pcs soon. Thanks for the info. I'll post once those tasks are done.
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Old 07-26-2013, 07:14 AM   #15
afbd5
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Replaced the TPS and found a loose ground wire pack in the process. It was the ground pack that bolts down next to the throttle body and is part of the TPS system. Once the TPS was replaced and the ECU reset everything is good to go and acting like it should.
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Old 07-26-2013, 06:17 PM   #16
CNY_Dave
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I had some funky shifting on my '03 H6 outback and cleaning those grounds was the thing that fixed it.
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